U.S. Open champion Sam Stosur held on to beat unseeded American teenager Sloane Stephens 7-5, 6-4 Sunday to reach the French Open quarterfinals.
The sixth-seeded Stosur appeared to have the match well in hand when she jumped out to a 5-1 lead in the second set. But the 19-year-old Stephens broke the Australian twice in a row to get within 5-4, before Stosur broke back to end it.
In the quarterfinals, 2010 French Open runner-up Stosur will face No. 15 Dominika Cibulkova, who upset No. 1 Victoria Azarenka.
Stephens' exit leaves Varvara Lepchenko, who's also unseeded, as the only U.S. singles player left in the tournament. Lepchenko takes on Wimbledon champion Petra Kvitova of the Czech Republic in the fourth round Monday.